Radio apparatus



www@ M 24 1927' JJ. W. RENAN ET AL RADIO APPARATUS Filed March 28, 3.925

shaft 50. The lerrule 47 and the socket member' 49 serve as the bearing bushings for journaling the trunnions 36 in bearing posts 5l which are fixedly secured to a base 52.

The rotor plates 46 are electrically connected to the socket member 49 by means of a wire burned through the wall of the casing 35 and electrically connected to said socket member and the shoe 42. Thus, the post-s 5l are electrically connected to therespective rotor plates and stator plates 4 6 and 40, and the said posts may be electrically connected to corresponding binding posts 53 in any suitable manner as indicated at 54.

For rotating the stud shaft and the casing 35 we may utilize an ordinary dial or knob 55. In the operation o't the condenser, it will be understood that the action of gravity will tend to maintain the stator plates 40 in fixed position, and that rotation of the casing 35 will move the rotor plates 46 relatively to the stator plates. It may be necessary to provide means to prevent oscillation of the plates 40, particularly where the condenser is used at a point where constant vibrations arev encountered. For this purpose we may utilize a block 56 of magnetic material such as steel, xedly mounted on the end of an arm 57 secured to the shaft 39, and mount a permanent magnet or electromagnet 60 in one of the bearing posts 5l opposite said block 56. Magnetic attraction of the block 56 by the magnet 60 will hold the plates 40 substantially stationary under all conditions.

For assembling the parts of the apparatus within the casing 35, we preferably initially form the casing of two complemental sections 61. Each of the sections has formed therein a portion of the dove-tail groove 41 and the shoe 42` is formed in two pieces. The rotor plate supporting block 43 is formed in one piece and is initially slid into one of the sections of the shoe 42. The stator plates 40 having been arranged so as to mount the shaft 39 in the respective bearing blocks 38, the two sections 6l are brought together so that the portion oit the shoe 42 carried by one section slides over the projecting end of the block 44 carried by the other section. The meeting edges of the casing sections 6l are then fused together in any suitable manner. after which the casing is evacuated according to known methods and with known apparatus.

From the above description, it will be understood that the invention enables the protection of radio apparatus from the effects of atmospheric conditions and accordingly losses commonly due to defective dielectrie or leakage between the plates or conducting parts, frictional hysteresis, eddy currents, etc. are eliminated.

The vacuous condition within the casing eliminates the gases of the atmosphere, so that all conducting paths which may be produced by the atmosphere are eliminated from the apparatus. Also, the intercapacities of the vacuum of the condenser will equalize and balance the intercapacities of the vacuum tubes used in radio receiving sets, thereby producing more perfect resonance. Furthermore, deterioration of the apparatus due to action of the elelnents is prevented.

While we have shown and described the invention embodied in an electric condenser it will be understood that the invention is susceptible of use in connection with any type of radio and electrical apparatus in which there are parts likely to be affected by atmospheric conditions, for instance, variometers, vario-couplers, etc. Therefore, we do not desire to be understood as limiting ourselves except as required by the following claims when construed in the light of the prior art.

Having thus described the invention, what we claim is:

l. Electrical apparatus comprising a rotatable electrical conducting element, a second electrical conducting element pendulously mounted coaXially with said rotatable member to cooperate therewith, means for rotating said first-mentioned conducting element relatively to the second-mentioned conducting element, and cooperating magnetic elements one mounted on a fixed support and the other mounted on the second-mentioned conducting element to hold said second-mentioned conducting element against oscillation.

2. Electrical apparatus comprising a vacuous rotatable casing, an electrical conducting element tiXedly mounted upon and within said casing, a second electrical conducting element pendulously mounted upon and within said casing coaxially therewith, means for rotating said casing, and cooperating magnetic elements one on the second-mentioned conducting element and the other fixedly mounted exteriorly of said casing for holding said second-mentioned conducting element against oscillation.

3. An electrical condenser comprising a rotatable casing including two cup-like sections having their edges secured together and formed with alined grooves opening through said edges substantially parallel with the axis of rotation of said casing, a plurality of spaced and parallel conducting plates fixedly mounted within said grooves, a plurality of spaced and parallel conducting plates pendulously mounted within said casing co-axially therewith in alternate relation to the first-mentioned plates, means for rotating said casing, and terminals for said plates extending through said easing. l

4f. Electrical apparatus comprising; a rotatable casingl including` two cup-like sections having; their edges connected together and formed with alined grooves opening through said edges substantially parallel with the aXis of rotation of said casing, a supporting block itted in said grooves and having transverse grooves, a plurality of conducting' plates one mounted edgeWise in each of said grooves, a plurality of spaced and parallel conducting,` plates pendulously mounted Within said casing (zo-axially there- With in alternate relation to the irst-ment-ioned plates, means :for rotating said casing, and terminals for said plates extending through said casing.

5. An electrical condenser comprising a vaeuous rotatable casing including,` two cuplike sections of fusible material having their edges fused together and formed With alined grooves opening` through said edges substantially parallel with the axis of rotation of said casing'` a plurality of spaced and parallel conducting plates xedly mounted Within said grooves, a plurality of spaced and parallel conducting plates pendulously mounted Within said easing` co-aXially therewith in alternate relation t0 the lirst-mentioned plates7 means Jfor rotating` said casing, and terminals for said plates extending through said casing.

JOHN J. WV. KENAN. VILLIAM M. CADY. 

